So B. It

You couldn't really tell about Mama's brain just from looking at her, but it was obvious as soon as she spoke. She had a high voice, like a little girl's, and she only knew 23 words. I know this for a fact, because we kept a list of the things Mama said tacked to the inside of the kitchen cabinet. Most of the words were common ones, like good and more and hot, but there was one word only my mother said: soof.